// ============================================================
// THE BEACON - Tutorial / Onboarding
// First-time player walkthrough (4 screens + skip option)
// ============================================================

const TUTORIAL_KEY = 'the-beacon-tutorial-done';

const TUTORIAL_STEPS = [
    {
        title: 'THE BEACON',
        body: 'Build an AI from scratch.\n\nWrite code. Train models. Deploy to the world.\nSave lives.',
        icon: '🏠',
        tip: 'A sovereign AI idle game'
    },
    {
        title: 'WRITE CODE',
        body: 'Click WRITE CODE or press SPACE to generate code.\n\nClick fast for combo bonuses:\n  10× combo → bonus ops\n  20× combo → bonus knowledge\n  30×+ combo → bonus code',
        icon: '⌨️',
        tip: 'This is your primary action'
    },
    {
        title: 'BUILD & RESEARCH',
        body: 'Buy Buildings for passive production.\nThey generate resources automatically.\n\nResearch Projects appear as you progress.\nThey unlock powerful multipliers and new systems.',
        icon: '🏗️',
        tip: 'Automation is the goal'
    },
    {
        title: 'PHASES & PROGRESS',
        body: 'The game has 6 phases, from "The First Line" to "The Beacon."\n\nEach phase unlocks new buildings, projects, and challenges.\n\nYour AI grows from a script... to something that matters.',
        icon: '📊',
        tip: 'Watch the progress bar at the top'
    },
    {
        title: 'YOU\'RE READY',
        body: 'Buildings produce while you think.\nProjects multiply your output.\nKeep harmony high. Avoid the Drift.\n\nThe Beacon is waiting. Start writing.',
        icon: '✦',
        tip: 'Press ? anytime for keyboard shortcuts'
    }
];

function isTutorialDone() {
    try {
        return localStorage.getItem(TUTORIAL_KEY) === 'done';
    } catch (e) {
        return true; // If localStorage is broken, skip tutorial
    }
}

function markTutorialDone() {
    try {
        localStorage.setItem(TUTORIAL_KEY, 'done');
    } catch (e) {
        // silent fail
    }
}

function createTutorialStyles() {
    if (document.getElementById('tutorial-styles')) return;
    const style = document.createElement('style');
    style.id = 'tutorial-styles';
    style.textContent = `
#tutorial-overlay {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(8, 8, 16, 0.96);
    z-index: 300;
    display: flex;
    justify-content: center;
    align-items: center;
    animation: tutorial-fade-in 0.4s ease-out;
}
@keyframes tutorial-fade-in {
    from { opacity: 0 } to { opacity: 1 }
}
#tutorial-card {
    background: #0e0e1a;
    border: 1px solid #1a3a5a;
    border-radius: 10px;
    padding: 32px 36px;
    max-width: 420px;
    width: 90%;
    text-align: center;
    animation: tutorial-slide-up 0.5s ease-out;
    position: relative;
}
@keyframes tutorial-slide-up {
    from { transform: translateY(20px); opacity: 0 }
    to { transform: translateY(0); opacity: 1 }
}
#tutorial-card .t-icon {
    font-size: 36px;
    margin-bottom: 12px;
    display: block;
}
#tutorial-card .t-title {
    color: #4a9eff;
    font-size: 16px;
    font-weight: 700;
    letter-spacing: 3px;
    margin-bottom: 12px;
    font-family: inherit;
}
#tutorial-card .t-body {
    color: #999;
    font-size: 11px;
    line-height: 1.9;
    margin-bottom: 20px;
    white-space: pre-line;
    font-family: inherit;
    text-align: left;
}
#tutorial-card .t-tip {
    color: #555;
    font-size: 9px;
    font-style: italic;
    margin-bottom: 20px;
    letter-spacing: 1px;
    font-family: inherit;
}
#tutorial-dots {
    display: flex;
    gap: 6px;
    justify-content: center;
    margin-bottom: 18px;
}
#tutorial-dots .t-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: #1a1a2e;
    transition: background 0.3s;
}
#tutorial-dots .t-dot.active {
    background: #4a9eff;
    box-shadow: 0 0 6px rgba(74, 158, 255, 0.4);
}
#tutorial-btns {
    display: flex;
    gap: 8px;
    justify-content: center;
}
#tutorial-btns button {
    font-family: inherit;
    font-size: 11px;
    padding: 8px 20px;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.15s;
}
#tutorial-next-btn {
    background: #1a2a3a;
    border: 1px solid #4a9eff;
    color: #4a9eff;
}
#tutorial-next-btn:hover {
    background: #203040;
    box-shadow: 0 0 12px rgba(74, 158, 255, 0.2);
}
#tutorial-skip-btn {
    background: transparent;
    border: 1px solid #333;
    color: #555;
}
#tutorial-skip-btn:hover {
    border-color: #555;
    color: #888;
}
    `;
    document.head.appendChild(style);
}

function renderTutorialStep(index) {
    const step = TUTORIAL_STEPS[index];
    if (!step) return;

    let overlay = document.getElementById('tutorial-overlay');
    if (!overlay) {
        overlay = document.createElement('div');
        overlay.id = 'tutorial-overlay';
        document.body.appendChild(overlay);
    }

    const isLast = index === TUTORIAL_STEPS.length - 1;

    // Build dots
    let dots = '';
    for (let i = 0; i < TUTORIAL_STEPS.length; i++) {
        dots += `<div class="t-dot${i === index ? ' active' : ''}"></div>`;
    }

    overlay.innerHTML = `
        <div id="tutorial-card">
            <span class="t-icon">${step.icon}</span>
            <div class="t-title">${step.title}</div>
            <div class="t-body">${step.body}</div>
            <div class="t-tip">${step.tip}</div>
            <div id="tutorial-dots">${dots}</div>
            <div id="tutorial-btns">
                <button id="tutorial-skip-btn" onclick="closeTutorial()">Skip</button>
                <button id="tutorial-next-btn" onclick="${isLast ? 'closeTutorial()' : 'nextTutorialStep()'}">${isLast ? 'Start Playing' : 'Next →'}</button>
            </div>
        </div>
    `;

    // Focus the next button so Enter works
    const nextBtn = document.getElementById('tutorial-next-btn');
    if (nextBtn) nextBtn.focus();
}

let _tutorialStep = 0;

function nextTutorialStep() {
    _tutorialStep++;
    renderTutorialStep(_tutorialStep);
}

// Keyboard support: Enter/Right to advance, Escape to close
document.addEventListener('keydown', function tutorialKeyHandler(e) {
    if (!document.getElementById('tutorial-overlay')) return;
    if (e.key === 'Enter' || e.key === 'ArrowRight') {
        e.preventDefault();
        if (_tutorialStep >= TUTORIAL_STEPS.length - 1) {
            closeTutorial();
        } else {
            nextTutorialStep();
        }
    } else if (e.key === 'Escape') {
        e.preventDefault();
        closeTutorial();
    }
});

function closeTutorial() {
    const overlay = document.getElementById('tutorial-overlay');
    if (overlay) {
        overlay.style.animation = 'tutorial-fade-in 0.3s ease-in reverse';
        setTimeout(() => overlay.remove(), 280);
    }
    markTutorialDone();
}

function startTutorial() {
    if (isTutorialDone()) return;
    createTutorialStyles();
    _tutorialStep = 0;
    // Small delay so the page renders first
    setTimeout(() => renderTutorialStep(0), 300);
}